Mailflow from Site A to Site B

Hi All,

to simplify my question/problem I have AD-site A and Site B, both have one Exchange 2013 Server CAS;MX.

On each server I have a signature/disclaimer software runing (Transport-Agent) with an individual config disclaimer config. My problem is that an e-mail from Server A to an user on Server B passby the "local" transport-agent von Server A, cause the Mailbox Transport Server from Server A connects directly to the transport service on Server B. Due to that, the mail didn't get the disclaimer attached which is configured on Server A.

Can I change the config on Server A, so that he will route the mail over his own "Transport Service" first?

Thanks a lot.